文章来源:未知 文章作者:meng 发布时间:2009-12-18 01:35 字体: [ ]  进入论坛

A single-atom-thick sheet of carbon, like those seen in pencil marks -- offers great potential for new types of nanoscale纳米级 devices, if a good way can be found to mold the material into desired shapes. Chemists at the University of Illinois at Chicago say it's possible, reporting that graphene石墨烯,单层石墨 can become quite pliable柔软的,柔韧的 using only a nanodroplet of water to do the job.

"Up until now, it wasn't thought we could controllably fold these structures," said Petr Král, assistant professor of chemistry at UIC. "But now we know how to shape graphene by using weak forces between nanodroplets carefully positioned on graphene sheets."

Král and two of his graduate students described the process in a recent article in Nano Letters, which is highlighted in Nature's "news and views" section Dec. 17.

Engineers already cut graphene into narrow ribbons and other shapes, expanding the set of carboneous systems such as fullerenes富勒烯, carbon nanotubes and nano-diamonds. Using computer simulations, Král showed that weak molecular4 interactions called van der Waals forces between water nanodroplets and graphene can shape it into a wide variety of forms, without the water and graphene chemically binding5.

"Depending on the size of the water droplet2 and the shape and size of graphene flake6 used, we can fold it in different shapes for various applications," said Král. "It's similar to the way proteins are folded in biological cells with the help of chaperone proteins."

Král and his students discovered they could use water droplets3 to roll, bend, slide and shape graphene into different complex structures such as capsules, sandwiches, knots and rings –- all potential building blocks of nanodevices with unique mechanical, electrical or optical properties. By using special techniques like atomic force microscopy显微镜检查 and carefully guided microscopic7 needles, water droplets水滴 and other materials can be carefully positioned on graphene to shape it into desired forms, he says.

Král's laboratory is studying potential uses of nanoscale graphene, such as ways to coat it with phospholipid磷脂 molecules8 that would allow it to become part of biological cell membranes9 where it might perform specific functions. His lab is also designing graphene sheet nanoscale pores that allow the building of novel ion离子 and molecular separation membranes for use in desalination脱盐作用 and other applications.

While the materials he works with are inorganic11, Král sees a growing trend to developing hybrid12混合的 multifunctional systems that combine inorganic无机物的 nanostructures with biological cellular13 systems.

"We're trying to detect signals from the biological world or pass signals to the biological world," he said. "In the future, perhaps proteins will evolve to interact with inorganic systems. It's a way of evolution to form a new interface14接口,界面, or hybrid system, working together on novel functions."


1 pliable ZBCyx     
  • Willow twigs are pliable.柳条很软。
  • The finely twined baskets are made with young,pliable spruce roots.这些编织精美的篮子是用柔韧的云杉嫩树根编成的。
2 droplet Ur7xl     
  • The rate of droplet growth under different conditions can be evaluated.可以计算在不同条件下的云滴增长率。
  • The test results showed that increasing droplet size was associated with better stability.试验结果表明,增加液滴尺寸将使稳定性提高。
3 droplets 3c55b5988da2d40be7a87f6b810732d2     
n.小滴( droplet的名词复数 )
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
4 molecular mE9xh     
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
5 binding 2yEzWb     
  • The contract was not signed and has no binding force. 合同没有签署因而没有约束力。
  • Both sides have agreed that the arbitration will be binding. 双方都赞同仲裁具有约束力。
6 flake JgTzc     
  • Drain the salmon,discard the skin,crush the bones and flake the salmon with a fork.将鲑鱼沥干,去表皮,粉碎鱼骨并用餐叉子将鱼肉切成小薄片状。
  • The paint's beginning to flake.油漆开始剥落了。
7 microscopic nDrxq     
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
8 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
9 membranes 93ec26b8b1eb155ef0aeaa845da95972     
n.(动物或植物体内的)薄膜( membrane的名词复数 );隔膜;(可起防水、防风等作用的)膜状物
  • The waste material is placed in cells with permeable membranes. 废液置于有渗透膜的槽中。 来自辞典例句
  • The sarcoplasmic reticulum is a system of intracellular membranes. 肌浆网属于细胞内膜系统。 来自辞典例句
10 desalination xwNxL     
  • Crops can be grown on this land after desalination. 这片土地经过脱盐就可以种植庄稼了。
  • One source is by desalination-taking the salt out of salt water to make it drinkable. 淡水的来源之一是使水淡化--把含盐的水中的盐份去掉,使之能够饮用。
11 inorganic P6Sxn     
  • The fundamentals of inorganic chemistry are very important.无机化学的基础很重要。
  • This chemical plant recently bought a large quantity of inorganic salt.这家化工厂又买进了大量的无机盐。
12 hybrid pcBzu     
  • That is a hybrid perpetual rose.那是一株杂交的四季开花的蔷薇。
  • The hybrid was tall,handsome,and intelligent.那混血儿高大、英俊、又聪明。
13 cellular aU1yo     
  • She has a cellular telephone in her car.她的汽车里有一部无线通讯电话机。
  • Many people use cellular materials as sensitive elements in hygrometers.很多人用蜂窝状的材料作为测量温度的传感元件。
14 interface e5Wx1     
  • My computer has a network interface,which allows me to get to other computers.我的计算机有网络接口可以与其它计算机连在一起。
  • This program has perspicuous interface and extensive application. 该程序界面明了,适用范围广。
TAG标签: water graphene nano droplet